#include "apue.h"
#include <pthread.h>

struct foo {
	int a, b, c, d;
};

void 
printfoo(const char *s, const struct foo *fp) {
	printf("%s", s);
	printf(" structure at 0x%lx\n", (unsigned long) fp);
	printf(" foo.a = %d\n", fp->a);
	printf(" foo.b = %d\n", fp->b);
	printf(" foo.c = %d\n", fp->c);
	printf(" foo.d = %d\n", fp->d);
}

void *
thr_fn1(void *arg) {
	struct foo fo = {1, 2, 3, 4};

	printfoo("thread 1:\n", &fo);
	pthread_exit((void *)&fo);
}

void *
thr_fn2(void *arg) {
	printf("thread 2 : ID is %lu\n", (unsigned long) pthread_self());
	pthread_exit((void *)0);
}

int 
main(void) {
	int err;
	pthread_t tid1, tid2;
	struct foo *tret;

	err = pthread_create(&tid1, NULL, thr_fn1, NULL);
	if (err != 0) {
		err_exit(err, "can't create thread 1");
	}

	err = pthread_join(tid1, (void *)&tret);
	if (err != 0) {
		err_exit(err, "can't join with thread 1");
	}
	sleep(1);
	printf("parent starting second thread\n");


	err = pthread_create(&tid2, NULL, thr_fn2, NULL);
	if (err != 0) {
		err_exit(err, "can't create thread 2");
	}
	sleep(1);
	printfoo("parent:\n", tret);

	exit(0);
}
